So ... the chain/sprocket replacement is sorta turning into a “while I’m in there ...” I’m going to replace the fork oil and also thinking about the 48-year-old springs. If they’re sagged it’s nothing too bad, but ... while I’m in there etc.
A few questions, which I’ll be most grateful if...

Hello, I’d like to hear what tyres you are all using on the 175cc bikes, I have a Michelin (Made in Italy) 2.75 x 19 ACS that is now only made in a 9” scooter size (:confused:) and the available tyres in that size are made by Cheng Shin, Mitas and Heidenau.
The front is a Pirelli that looks like...

Hi all, I'm replacing chain and sprockets on my '72 350B Sport (6v). Am aware that the chain is a 428 size, but I see that there are varieties of 428, i.e. 428-126, 428-136 ... My guess is that the latter figure might be the outside width (e.g. 12.6mm, 13.6mm) - although I don't see why that...